$(function () {
    $('.main-box-left-main span:nth-child(2)').on('click', function () {
        $('.main-box-left-main').removeClass('asd');
        $('.main-box-left-main span:nth-child(2)').html('未选中')
        $(this).parent().addClass('asd');
        this.innerHTML = '已选中'
    })
})